opengl problem under vista

#include<windows.h>
#include<glgl.h>
#include<glglu.h>
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")

void InitGL(void)
{
glClearColor(1,0.3f,0.3f,0.3f);
}

void DrawGLScene(void)
{
/* code removed */
}

HGLRC hRC = NULL;
HDC hDC = NULL;
HWND hWnd = NULL;
HINSTANCE hInstance = NULL;
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

bool CreateGLWindow(char* title, int width, int height)
{
GLuint PixelFormat;
WNDCLASS wc;
RECT WindowRect;
WindowRect.left = (long)0;
WindowRect.right = (long)width;
WindowRect.top = (long)0;
WindowRect.bottom = (long)height;
LPCSTR nazwa = TEXT("Start");

hInstance = GetModuleHandle(NULL);
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wc.lpfnWndProc = (WNDPROC)WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = nazwa;

RegisterClass(&wc);

hWnd = CreateWindowEx(WS_EX_APPWINDOW | WS_EX_WINDOWEDGE, nazwa,
					  nazwa,
					  WS_SYSMENU |
					  WS_CLIPSIBLINGS |
					  WS_CLIPCHILDREN,
					  0,0,
					  width,
					  height,
					  NULL,
					  NULL,
					  hInstance,
					  NULL);

static PIXELFORMATDESCRIPTOR pfd =
{
	sizeof(PIXELFORMATDESCRIPTOR),
	1,
	PFD_DRAW_TO_WINDOW |
	PFD_SUPPORT_OPENGL |
	PFD_DOUBLEBUFFER,
	PFD_TYPE_RGBA,
	32,
	0,0,0,0,0,0,
	0,
	0,
	0,
	0,0,0,0,
	16,
	0,
	0,
	PFD_MAIN_PLANE,
	0,
	0,0,0
};

hDC = GetDC(hWnd);
PixelFormat = ChoosePixelFormat(hDC, &pfd);
HRESULT rez = SetPixelFormat(hDC, PixelFormat, &pfd);
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
ShowWindow(hWnd, SW_SHOW);
InitGL();
return true;

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch(uMsg)
{
case WM_ACTIVATE:
	{
		return 0;
	}
case WM_CLOSE:
	{
		PostQuitMessage(0);
		return 0;
	}
}

return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
bool done = false;

if (!CreateGLWindow(NULL, 800,600))
{
	return 0;
}

while(!done)
{
	if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
	{
		if (!GetMessage(&msg, 0, 0, 0)) done = true;
		else {
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	else
	{
		DrawGLScene();
		SwapBuffers(hDC);
	}
}

return (msg.wParam);
}